diff --git a/lang/cem/lint/lpass2/checkargs.c b/lang/cem/lint/lpass2/checkargs.c
index e32e5a6f7..f4aeca421 100644
--- a/lang/cem/lint/lpass2/checkargs.c
+++ b/lang/cem/lint/lpass2/checkargs.c
@@ -21,7 +21,7 @@ PRIVATE chk_argtps();
 PRIVATE char *next_argtype();
 PRIVATE int type_match();
 PRIVATE form_type();
-PRIVATE conv_format(id, act, form);
+PRIVATE conv_format();
 
 int
 type_equal(act, form)